Salicylates

ABSTRACT

A complex consisting essentially of (R1,R2,R3,R4N )n (Mg )n1 (ArCOO )n2 (Ar&#39;&#39;COO )n3 (X )n4 (H2O)n5 WHEREIN R1, R2, R3 and R4 are selected from the group consisting of hydrogen, alkyl of one to 20 carbon atoms, hydroxyalkyl of one to 20 carbon atoms, carboxyalkyl of one to 20 carbon atoms and aralkyl of 1 to 20 carbon atoms in the alkyl moiety, Ar and Ar&#39;&#39; are an aromatic monocycle or substituted aromatic monocycle, X is sulfate, chloride or substituted carboxylate, N, N1 AND N2 ARE INTEGERS OF AT LEAST ONE, AND N3, N4 AND N5 ARE ZERO OR AN INTEGER OF AT LEAST 1, PROVIDED THAT WHEN (R1, R2, R3, R4 N )n is choline, (Mg )n1 is magnesium, (ArCOO )n2 is salicylate and n3 is zero, (X )n4 is not sulfate, is produced by reacting a salicylate compound with a magnesium salt. The complexes produced exhibits analgesic, anti-pyretic, anti-inflammatory and anti-rheumatic acitivity. A particularly valuable compound is choline magnesium salicylate.

United States Patent [1 1 Rosen et al.

[ll] 7 3,759,980 Sept. 18, 1973 SALICYLATES [7 51 Inventors: William E. Rosen, Summit; Philip A.

Berke, Milburn, both of NJ.

[73] Assignee: Stockton Chemicals, Inc., Union,

[22] Filed: May 26, 1969 21 AppL Non 827,893

52 user. 260/480,260/474,260/479 R,

260/479 S, 260/50l.l, 260/50l.l5, 260/50l.l7, 260/567.6 M, 424/230, 424/231,

. 424/233 [51] Int. Cl. C07c 69/86 [58] Field of Search....'. 260/474, 501.15, 260/480; 424/233 [56] References Cited FOREIGN PATENTS OR APPLICATIONS 708,865 5/1954 Great Britain 260/50Ll5 l,076,968 7/1967 Great Britain 260/50l.l5

Primary Examiner-Leon Zitver Assistant Examiner-Michael W. Glynn Attorney-Jac0bs and Jacobs [57] ABSTRACT A complex consisting essentially of (R,,R,,R,,R,N*),, (Mg ),,l (ArC0O'),2 (Ar'C0O),,3 (X),,4 (H,O),,5 wherein R,, R,, R, and R, are selected from the group consisting of hydrogen, alkyl of one to 20 carbon atoms, hydroxyalk-yl of one to 20 carbon atoms, carboxyaikyl of one to 20 carbon atoms and araikyl of I to 20 carbon atoms in the alkyl moiety,

Ar and Ar are an aromatic monocycle or substituted aromatic monocycle,

, X is sulfate, chloride or substituted carboxylate,

n, n and n are integers of at least one, and

n, n and n are zero or an integer of at least i, provided that when (R,, R R,, R, N), is choline, (Mg ),,l is magnesium, (ArCO0 ),,2 is salicylate and n is zero, (X'),,4 is not sulfate, is produced by reacting a salicylate compound with a magnesium salt. The complexes produced exhibits analgesic, anti-pyretic, anti-inflammatory and anti-rheumatic acitivity. A particularly valuable compound is choline magnesium salicylate.

s Claims, no Drawings SALICYLATES The present invention is concerned. with salicylate compounds. The exact nature of these compounds is not fully understood and compound is intended -to include, inter alia,compounds,'complexes and compound complexes. it is clear that the salicylate compounds of the present invention are new distince entities and consist essentially of the following:

wherein p I R,, R R and R are selected from the group consisting of hydrogen, alkyl of one to 20 carbon atoms, hydroxyalkyl of 1 to 20 carbon atoms, carboxyalkyl of one to 20 carbon atoms and aralkyl of one to 20 carbon atoms in thealkyl moiety, Ar and Arare an aromatic monocycle or substituted aromatic monocycle, X is sulfate, chloride or substituted carboxylate, n, n, and n are integers of at least one, and n, n, and n are zero or an integer of at least 1, provided that when (R,, R R R N),, is choline, (Mg ),,l ismagnesium, (ArCOO),,2 is salicylate and n is zero, (X"),,4 is not sulfate. in apreferred embodimerit of the present invention, n, n and n are integers frorn' l to 30 and n, n, andnare zero or integers from 1 to 30. Examples of Ar and Ar are phenyl and phenyl substituted by hydroxyl or C0 lower alkyl especially OCOCH In one group of compounds of the present invention n is zero and 'n, n', n, n, and n are integers from 1 to 30. As will be noted from the above, water may be present of absent. The salicylate compounds of the present invention are solids which can be granulated,ftableted and ene'apsulated'in contrast to such salicyla'tes as choline salicylate and present a number of additional advantages. 1

Choline salicylate is well known to have desirable physiologic properties as described in the paper by Robert H. Broh-Kahn, M.D., entit1ed:"Symposium on Choline Salicylate," and published in the lntemational Record of Medicine, vol. 173, No. 4, pp. 2l7'-232, April 1960. The preparation and uses of choline salicylate have been the subject of several United States patents particularly those of Broh-Kahn et al, U.S. Pat. No. 3,069,321, and Lorz et al, U.S. Pat. No. 3,141,035, in which the preparation of solid crystalline choline salicylate has been described. The crystallization process, as described, requires the use of anhydrous organic solvents which are expensive and must be kept anhydrous. The crystallization of the finalproduct'is difficult because of the extreme hydroscopicity of the product.

Because of its deliquescence choline salicylate is extremely difficult to handle. Unless it is kept in a com pletely dry atomsphere, it veryquickly absorbs: water and'becomes amorphous, sticky and finally liquid. As a result it is not feasible to maintain cholne salicylate in the solid state. it is for this reason that therapeutic doses of choline salicylate must be dispensed in liquid form usually as an aqueous solution.

It is well known that the handling and dispensing of liquid'preparations is more difficult than of solids. Liquids must be bottled which is expensive and is usually accompanied by breakage and spillage. There is also the uncertainty inherent in the dispensing of a uniform dosage. A solid dry stable preparation would overcome these disadvantages especially in the administration of line salicylate on the carrier to give a therapeutic dose in the form of a tablet or capsule. The finished tablet or capsule of choline salicylate containing a sufficient amount of active material to fulfill its therapeutic purpose would be of such bulk or size as to make it impractical to ingest. Also many carriers are objectionable from the standpoint of cost, taste, smell, bulk, etc.

The present invention overcomes all of these objections and provides stable compounds thereby overcoming the extreme hygroscopicity of choline salicylate as well as the deliquescence which makes it extremely difficult to handle.

The present invention also overcomes the difficulties inherent in the handling and dispensing of other oily or hydroscopic salicylate or acetylsalicylate derivates by converting them into solid compounds.

The compounds of the present invention may contain water and while it has been conveniently found that from about zero to about 20 percent waterisa range providing for most convenient handling of the compositions, a greater amount of water can be present if desired. In place of the waterjin the compounds of the present invention, a chemically equivalent solvent can be'used without affecting the basic nature of the present invention. I

While the working examples refer to certain ratios of components of which the present compounds consist,

such terminology is used for convenience since as above indicated the compounds of the present invention are new chemical entities and the components no longer exist as separate entities.

The compounds according to the present invention are useful for their analgesic, anthpyretic, antiinflammatory and anti-rheumatic activity and maybe administered in the same-general manner and amounts asknown analgesics, anti-pyretics, anti-inflammatories and anti-rheumatics such as, for example, aspirin. The compounds according to the present invention are stable,'dry, non-deliquescent, generally free-flowing powders and as such can be formulated into tablets, capsules, and the like according to techniques which are per se known to those familiar with pharmaceutical techniques according to known procedures.

The compounds of the present invention may be produced by mixing an aqueous solution of a salicylate such as choline salicylate with an aqueous solution of a magnesium salt with each component being present in an amount such that the final product'will have the desired concentration of salicylate. Alternatively a magnesium salt can be added'asa solid to an aqueous salicylate solution and the mixture agitated until the magnesium salt is dissolved to give a homogeneous solution. In either case, the solution thus obtained may be evaporated .to the degree of dryness desired and the solid obtained is powdered in a suitable mill to the desired particle size.

The solution may beevaporated to dryness in any of the known manners in vacuo at temperatures from 60C. to C. but temperatures higher than 120C. or

The compounds of the present inventiori may ailidfb w hm f m r f z M f erg O 8 1' mg l'fl IO IC 0 comcombined in the form of pharmaceutical compositions material mums PM imimd with one or more other therapeut1c compounds. Any 90% Magnesium material therapeutic compound with which it is desired to comh s, Saheylate h h h I n d Salicylate Tetrahydrate Choline Sahcylate:

me t e ana ges1c, a nt1-pyret1c, an 1-1n ammatory an Magnesium Saucy, ant1-rheumat1c activity of the compounds of thepres- 221.1 g :gg: 90:10 40.5 g

etnt invention may be used sub ect only to compatabrl 391 g 8.84 70:30 1 y. 1 v

The following non-limitative examples more particu- E A PLE 4 lady Illustrate the present Invention. w Choline Acetylsalicylate with Magnesium Sulfate EXAMPLE 1 A solution of 2.l g of oily choline acetylsalicylate and Choline salicylate with magnesium salicylate H 8 of magnesium Sulfate heptahydl'ate m 24 ml of A mixture of 17.02 g of 90% choline salicylate, 18.84 water was heated at redufied P e" e the vent was gone, 27 g of a mixture of white solid complex water was warmed on the steam bath and agitated to of ehohhe magnesium y y a Shlfate P h give a clear yellow solution, w t was removed by cess oily choline acetylsahcylate remained; the solid drying at reduced pressure and elevated temperature, complex was Isolated y femoval of the P' giving a white solid having a composition of -23% when the same expemheht was earned out g of magnesium salicylate tetrahydrate, and 12 ml of choline, 34.5% magnesium, 70-74% salicylate and 20 twice as much magnesium sulfate heptahydrate 8 2-4% water. These assays correspond to a compound P a after yi was a solid complex of ehohhe having the approximate molar proportions of 5:4:l3z3, magnesium acetylsahcylate sulfate. Other proportions respectively. On a weight ratio basis the preferred perof reactants ga Solid O P BX products. czzentsaqgezgf 9c(l)1; 0line:magnesium: salicylate are l-30%: 25 Choline acetysalicylate To 47.8 g of 75% aqueous solution of choline bicar- EXAMPLE 2 bonate was added a total of 43.5 g of salicylic acid.' Choline Salicylate with Magnesium Salicylate After one hour of reaction at room temperature, the

In the Same way as in Example 1, relative amounts of salicylic acid had dissolved and carbon dioxide gas had choline salicylate to magnesium salicylate ranging (on evolvede clear yellow sollltlon, Whleh a 3 P" of an anhydrous basis) from 60%:40% to l0%:90% 7, was taken to dryness by heating at 100C in vacuum (Weightweight, respectively) were dissolved in aquefor 10-11 hours, leaving 69.3 g of oily choline acetylsaous solution and dried at reduced pressure and elevated licylate. H temperature. The resultmg white solid was capable of EXAMPLE 5 incorporating various amounts of water w1thout apv pearing wet"-looking. More vigorous drying condi- Choline Acetylsahcylatewrth Magnesium Sahcylate tions (e.g., higher temperatures, higher vacuum and/or A solution of 21 g of oily chohne acetylsahcylate and longer drying times) gave product having lesser 22 g of magnesium salicylate tetra hydrate 1n 24 ml of amounts of incorporated water. water was freed of solvent by heating at reduced-pres- Percentage ratio of starting material weights, Weight of starting materials anhyd. Water content of solid choline product, percent Magnesium salicylate: Molar ratio 90%eholi11e salicylate magnesium Short Medium Long salicylate (g.) tetrahydrate (g.) salicylate drying drying drying ChoL. Mg. Sallcyl. 25.2 18.84 00:40 10.6 2.1 0.7 01 0.05 0.2 16.8 18.84 -=-ao- 10.5 2.0 1.7 0.00 0.05 0.10 11.2 18.84 40=00 6.8 1.9 1.3 0.04 0.05 0.14 7.2 18.84 30:70 9.7 0.9 0.3 0.03 0.05 0.13 4.2 18.84 20=so 10.7 3.2 1.2 v 0.02 0.05 0.12 1.9 18.84 10:90 19.4 3.1 0.5 0.01 0.05 0.11

EXAMPLE 3 I i sure. The 40 got. off-white solid product left after removal of water was f'a complex of choline magnesium Choline Salicylate with Magnesium Salicylate acetylsalicylate salicylate.

In the same y as mp relahve amounts 9? 0 Other proportions of reactants also gave solid prodcholine salicylate to magnesium salicylate ranging .(,0n"' j.

an anhydrous basis) from %:30% to -;%:l0 (weightzweight, respectively) weredissolvedjn aquem g 4 EXAMPLE 6 ous solution and dried at reduced pressure and elevated {Brim thylarnmonium acetylsalicylate with Magnesium temperature. The solid white product contained-vi s-- ,-sul fate cous yellowliquid which was removed by filtration. White solid choline magnesium salicylate complex was licylate, and 5.3 g of magnesium sulfate heptahydrate isolated in yields as shown in the following table). in ll ml of water was prepared by swirling and gentle .-A..solution of 8.4g of trimethylammonium acetylsa- I warming on a steam bath. Solvent was removed by drying at 100C. and reduced pressure, leaving 9.6 g of a mixture of excess oily trimethylammonium acetylsalicylate plus white solid complex of trimethylammonium magnesium acetylsalicylate sulfate. The white solid was separated by removal of the oil.

When the same experiment was carried out using twice as much magnesium sulfate heptahydratev (10.6 g), the product after drying was a,solid complex of trimethylammonium magnesium acetylsalicylate sulfate (1 1.4 g). Other proportions of reactants also gave solid complex products.

Trimethylammonium acetylsalicylate A mixture of 26.6 g of 25% aqueous trimethylamine and 19.9 g of acetylsalicylic acid was stirred at room temperature for 30 minutes, giving a clear colorless solution of pH 5.6. After standing overnight, the solution was dried at 100C in vacuum over hours, leaving a clear colorless oil of trimethylammonium acetylsalicylate EXAMPLE 7 Trimethylammonium acetylsalicylate with Magnesium salicylate A solution of 8.4 g oftrimethylammonium acetylsalicylate and 10.9 g of magnesium salicylate tetrahydrate in 1 1 ml of water was prepared by gentle warming on a steam. bath. The clear solution was freed of solvent by heating at 100C. at reduced pressure. The 13.9 g of white solid product was a comples of trimethylammonium magnesium acetylsalicylate salicylate. Other proportions of reactants also gave solid complex products.

EXAMPLE 8 Trimethylammonium salicylate with Magnesium sulfate A solution of 29 g of trimethylammoniumsalicylate, prepared by allowing 36 g of 25% aqueous trimethylamine and g of salicylic acid to react at roomtemperature, and 21 g of magnesium sulfate heptahydrate in 36 ml of water was prepared by warming the mixture gently on the steam bath with swirling. Water was removed at reduced pressure and heating at 100C, leaving 43 g of a mixture of solid productwhich was a complex of trimethylammonium magnesium salicylate sulfate plus an oil which was excess trimethylammonium salicylate. The solid complex was isolated by removal of the oil.

When the same experiment was carried. out using twice as much magnesium sulfate heptahydrate (42 g), the product after drying was a solid complex of trimethylammonium magnesium salicylate sulfate. Other proportions of reactants also gave solid compelx products.

EXAMPLE 9 Trimethylammonium salicylate with Magnesium salicylate A solution of 29 g of trimethylammonium salicylate and 44 g of magnesium salicylate tetrahydrate in 36ml of water was prepared by gentle warming and swirling.

Removal of water by drying at 100C. and reduced pressure left 64 g of white solid product, which was a complex of trimethylammonium magnesium salicylate.

Other proportions of reactants also gave solid complex products.

EXAMPLE l0 and 28.1% water corresponding to molar proportions of approximately 1:10:30.

When the original reaction mixture was allowed to stand overnight, and water was removed at reduced pressure and at 100-110C, 19.2 g of white solid was isolated.

EXAMPLE ll Methyl salicylate with Magnesium salicylate A solution of 13.56 g of methyl salicylate and 18.84 g of magnesium salicylate in 50 ml of methanol was allowed to stand at room temperature for a few hours and thenv the solvent was removed by heating at reduced pressure. The white pasty solid methyl. salicylatemagnesium salicylate weighed 31.9 g. The white pasty solid contained the equivalent molar ratios of methyl salicylate-magnesium salicylate and water of about EXAMPLE 12 Methyl salicylate with Magnesium sulfate A mixture of 13.56 g of methyl salicylate, 12.54 g of magnesium sulfate heptahydrate and 100 ml of methanol was heated on the steam bath. After standing at room temperature, the white solid precipitation was collected and dried, giving 7.2 g of white solid complex, containing the equivalent of approximately 1:7:4 molar proportions of methyl salicylate, magnesium sulfate and solvent, respectively.

EXAMPLE 13 Choline chloride with Magnesium salicylatev A mixture of 16.6 g of aqueous choline chloride solution, 25.8 g of magnesium salicylate tetrahydrate, and 30 ml of water was gently warmed on the steam bath and swirled to a clear colorless solution. Drying at -120C. at reduced pressure for 5 hours left 36.9 g of white solid, of choline magnesium chloride salicylate.

What is claimed is:

l. A non-deliquescent solid composition of matter selected from the group consisting of (1) a complex consisting essentially of the magnesium cation, choline cation and at least one anion selected from the group consisting of the salicylic acid anion and the acetylsalicylic acid anion, the molar ratio of magnesium cation to choline cation being from about 1:2 to about 5:1 and the molar content of said anion being equal to the sum of the molar content of choline plus twice the molar content of magnesium and (2) hydrates of said complex.

2. A composition of matter according to claim 1 wherein the anion is the salicylic acid anion.

3. A composition of matter according to claim I wherein the anion is the acetylsalicylic acid anion.

4. A composition of matter according to claim 1 wherein both the salicylic acid anion and the acetylsalicylic acid anion are present. 

2. A composition of matter according to claim 1 wherein the anion is the salicylic acid anion.
 3. A composition of matter according to claim 1 wherein the anion is the acetylsalicylic acid anion.
 4. A composition of matter according to claim 1 wherein both the salicylic acid anion and the acetylsalicylic acid anion are present.
 5. A composition of matter consisting of magnesium cations, choline cations, and salicylic acid anions which in its hydrated form has a molar ratio of magnesium:choline:salicylic acid:water of 4:5:13:3. 